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linux/arch/powerpc/include/asm/fpu.h
Samuel Holland 01db473e1a powerpc: implement ARCH_HAS_KERNEL_FPU_SUPPORT
PowerPC provides an equivalent to the common kernel-mode FPU API, but in a
different header and using different function names.  The PowerPC API also
requires a non-preemptible context.  Add a wrapper header, and export the
CFLAGS adjustments.

Link: https://lkml.kernel.org/r/20240329072441.591471-9-samuel.holland@sifive.com
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com> 
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: WANG Xuerui <git@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-05-19 14:36:18 -07:00

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C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2023 SiFive
*/
#ifndef _ASM_POWERPC_FPU_H
#define _ASM_POWERPC_FPU_H
#include <linux/preempt.h>
#include <asm/cpu_has_feature.h>
#include <asm/switch_to.h>
#define kernel_fpu_available() (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
static inline void kernel_fpu_begin(void)
{
preempt_disable();
enable_kernel_fp();
}
static inline void kernel_fpu_end(void)
{
disable_kernel_fp();
preempt_enable();
}
#endif /* ! _ASM_POWERPC_FPU_H */